/******************************************************************************
 * Copyright (c) 2013-2016 Realtek Semiconductor Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
#ifndef _LINUX_IP_H
#define _LINUX_IP_H
#include <rtw_byteorder.h>

/* SOL_IP socket options */
#ifndef IPTOS_TOS_MASK
#define IPTOS_TOS_MASK 0x1E
#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
#define IPTOS_LOWDELAY 0x10
#define IPTOS_THROUGHPUT 0x08
#define IPTOS_RELIABILITY 0x04
#define IPTOS_MINCOST 0x02

#define IPTOS_PREC_MASK 0xE0
#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
#define IPTOS_PREC_NETCONTROL 0xe0
#define IPTOS_PREC_INTERNETCONTROL 0xc0
#define IPTOS_PREC_CRITIC_ECP 0xa0
#define IPTOS_PREC_FLASHOVERRIDE 0x80
#define IPTOS_PREC_FLASH 0x60
#define IPTOS_PREC_IMMEDIATE 0x40
#define IPTOS_PREC_PRIORITY 0x20
#define IPTOS_PREC_ROUTINE 0x00
#endif

/* IP options */
#define IPOPT_COPY 0x80
#define IPOPT_CLASS_MASK 0x60
#define IPOPT_NUMBER_MASK 0x1f

#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)

#define IPOPT_CONTROL 0x00
#define IPOPT_RESERVED1 0x20
#define IPOPT_MEASUREMENT 0x40
#define IPOPT_RESERVED2 0x60

#define IPOPT_END (0 | IPOPT_CONTROL)
#define IPOPT_NOOP (1 | IPOPT_CONTROL)
#define IPOPT_SEC (2 | IPOPT_CONTROL | IPOPT_COPY)
#define IPOPT_LSRR (3 | IPOPT_CONTROL | IPOPT_COPY)
#define IPOPT_TIMESTAMP (4 | IPOPT_MEASUREMENT)
#define IPOPT_RR (7 | IPOPT_CONTROL)
#define IPOPT_SID (8 | IPOPT_CONTROL | IPOPT_COPY)
#define IPOPT_SSRR (9 | IPOPT_CONTROL | IPOPT_COPY)
#define IPOPT_RA (20 | IPOPT_CONTROL | IPOPT_COPY)

#define IPVERSION 4
#define MAXTTL 255
#define IPDEFTTL 64

/* struct timestamp, struct route and MAX_ROUTES are removed.

   REASONS: it is clear that nobody used them because:
   - MAX_ROUTES value was wrong.
   - "struct route" was wrong.
   - "struct timestamp" had fatally misaligned bitfields and was completely unusable.
 */

#define IPOPT_OPTVAL 0
#define IPOPT_OLEN 1
#define IPOPT_OFFSET 2
#define IPOPT_MINOFF 4
#define MAX_IPOPTLEN 40
#define IPOPT_NOP IPOPT_NOOP
#define IPOPT_EOL IPOPT_END
#define IPOPT_TS IPOPT_TIMESTAMP

#define IPOPT_TS_TSONLY 0	/* timestamps only */
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 3   /* specified modules only */

#ifdef PLATFORM_LINUX

struct ip_options {
	__u32 faddr; /* Saved first hop address */
	unsigned char optlen;
	unsigned char srr;
	unsigned char rr;
	unsigned char ts;
	unsigned char is_setbyuser:1; /* Set by setsockopt?			*/
	unsigned char is_data:1;				/* Options in __data, rather than skb	*/
	unsigned char is_strictroute:1;			/* Strict source route			*/
	unsigned char srr_is_hit:1;				/* Packet destination addr was our one	*/
	unsigned char is_changed:1;				/* IP checksum more not valid		*/
	unsigned char rr_needaddr:1;			/* Need to record addr of outgoing dev	*/
	unsigned char ts_needtime:1;			/* Need to record timestamp		*/
	unsigned char ts_needaddr:1;			/* Need to record addr of outgoing dev  */
	unsigned char router_alert;
	unsigned char __pad1;
	unsigned char __pad2;
	unsigned char __data[0];
};

#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
#endif

struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8 ihl:4,
		version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8 version:4,
		ihl:4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	__u8 tos;
	__u16 tot_len;
	__u16 id;
	__u16 frag_off;
	__u8 ttl;
	__u8 protocol;
	__u16 check;
	__u32 saddr;
	__u32 daddr;
	/*The options start here. */
};

#endif /* _LINUX_IP_H */
